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Understanding the aging process of aerosol particles is important forassessing their chemical reactivity, cloud condensation nuclei activity,radiative properties and health impacts. In this study we investigate the agingof black carbon containing particles in an idealized urban plume using a newapproach, the particle-resolved aerosol model PartMC-MOSAIC. We present amethod to estimate aging time-scales using an aging criterion based on cloudcondensation nuclei activation. The results show a separation into a daytimeregime where condensation dominates and a nighttime regime where coagulationdominates. For the chosen urban plume scenario, depending on thesupersaturation threshold, the values for the aging time-scales vary between0.06 hours and 10 hours during the day, and between 6 hours and 20 hours duringthe night.

Estimating black carbon aging time-scales with a particle-resolved aerosol model